Experimental Evaluation of Maximum Achievable Efficiency for Multiple-Receiver Inductive Power Transfer Systems

Reona SUGIYAMA  Quang-Thang DUONG  Minoru OKADA  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E101-A    No.11    pp.1861-1868
Publication Date: 2018/11/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E101.A.1861
Type of Manuscript: PAPER
Category: Analog Signal Processing
inductive power transfer,  multiple-receiver,  optimal loads,  maximum achievable efficiency,  kQ-product,  

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Optimal loads and maximum achievable efficiency for multiple-receiver inductive power transfer (IPT) system have been formulated by theoretical studies in literatures. This paper presents extended analysis on system behavior at optimal load condition and extensive S-parameter evaluation to validate the formulas. Our results confirm that at the optimal load condition, the system is in a resonance state; the impact of cross-coupling among receivers is completely mitigated; and the efficiency reaches its maximum expressed by an efficiency angle tangent, in an manner analogous to the well-known kQ-theory for single-receiver IPT. Our contributions do not lie in practical applications of multiple-receiver IPT but in establishing principles for design and benchmarking the system.